Bolt-machine



' 2 Sheets-Sheet t. T. F. TAFT.

I .Making Bolts. v No. 14,258. Patented Feb. t2. 1856.

2 Sheet--Sheet 2.

No. 14,258. i Patented Feb. 12, 1856.

TTE STATES PATENT OFFICE.

TIMOTHY F. TAFT, OF FITCHBURG, MASSACHUSETTS.

BOLT-MACHINE.

Specification of Letters Patent No. 14,258, dated February 12, 1856.

To all whom t may concern Be it known that I, T. F. TAFT, of Fitchburg, in the county of Worcester and State of Massachusetts, have invented certain new and useful Improvements in Machines for Manufacturing Bolts, of which the following is a full, clear, and exact description, reference being had to the annexed drawings, making part of this specification, in which- Figure l, is a front elevation; Fig. 2, a vertical section upon the line A, A, of Fig. 1; Fig. 3, a plan of the parts above the line B, of Fig. l; Fig. 4, section upon the line B, B, of Fig. 1, and plan of the parts beneath; Fig. 5, an isometric view of a portion of the operating parts detached; Figs. 6, 7, 8, 9, 10, and 11, details which will be more particularly referred to hereafter.

To enable others skilled in the art to understand my invention, I will proceed to describe the manner in which I have carried it out, describing first the general features of the machine, and then more particularly the details which form the subjectof my present invention.

The bottom casting-D, is firmly secured to a foundation of stone, or other suitable masonry. From this casting rise the uprights C, which support the operating parts of the machine, and carry the bed piece E. From the latter rise the standards F, which with the uprights C carry the driving shaft G. The t-ie rods D2, serve to give additional support to the uprights C.

H, are driving pulleys and fly wheels upon the shaft G.

I, are eccentrics which operate the toggles K, by which means motion is given to the slides or carriages L, in which are secured the side punches z', z', that form the sides of the bolt heads, the operation of which will be more fully described hereafter. The header or upsettingpunch M, is caused to rise and descend by the eccentric N, and strap N' upon the driving shaft Gr.

C, is a socket which slides freely upon the punch M, the hole through the socket for the passage of the punch being slightly larger than the head of the bolt to be made. This socket is forced down into the position represented in Fig. 2, by india rubber or other springs, or it may be allowed to play so freely as to drop of itself. When the punch descends the socket precedes it, passl would be danger at times that the bolt would cling to the socket and be drawn out of the heading tool. To prevent this, I employ a device for the purpose of throwing up the socket before the punch rises, and while the latter still holds down the bolt, which will be hereafter more particularly described.k

I will now describe the construction and operation of the bolt holder. This holder which is represented at P, Fig. 9, is sup-- ported by its carrier Q, within which it is caused to revolve intermittently in the following manner: R, is a gear upon the driving shaft, which engages with the gear S,

.upon the short shaft T, which also carries the 'miter gear U. This latter engages with a similar gear W, upon the vertical shaft X. Y, isa wheel'having'two teeth (Fig. 6).; Z, a similar wheel with three teeth (Fig. 8),

the two being attached to a sleeve V, which is made adjustable upon the shaft X, byY

means of a screw, so that the upper wheel Y, may be made to engage with the cog wheel A', or the lower wheel Z, with the wheel B', as desired for the purpose of revolving the bolt holder as will be hereafter more fully explained. The wheels A', B', are secured to the vertical shaft` C', (Fig. 2) which also carries a gear D', that engages with a similar gear E', upon the bottom of the bolt holder.

In place of the arrangement above described a dog upon the vertical shaft X, may be caused to engage each time it revolves with one of the teeth of a four or six toothed wheel, and thus cause the shaft C', to make one fourth or one sixth of a revolution as required.

The bolt holder is swung in and out of position, for the purpose of putt-ing in the blank, and taking out the finished bolt, in the following manner: The gudgeons F', of the carrier Q, rest in boxes G', in the uprights C; H' is a slide of the form represented in Fig. 2, which is out away at I', for

the passage of the shaft X. This slide is connected with thec arrier Q, by the link K', and is moved back and forth for the purpose of throwing the bolt holder in and out of position, as follows: is a sleeve which revolves with the shaft X, upon which it is allowed to slide with a spline. Thissleeve carries the cams W', YV', and is raised or lowered by the fork X', operated by the hand lever Y' pivoted at a. YVhen the lever Y',is depressed, the sleeve U',is raised so as to bring its cams opposite to the pin Z), upon the slide H', which is thus moved in the direction of the arrow y, (Fig. 2.) When the slide is depressed the cams as they revolve strike against the pin c, and the slide H', is thrown in the opposite direction, carrying with it the bolt holder which is thus thrown into the position seen in red in Fig. 10.

It will be seen by an inspection of Fig. 2

that the point of support F' of the bolt holder is not beneath the center of the latter,but upon one side, and it therefore becomes necessary when the pressure comes upon the holder, that it be held firmly to prevent it from being thrown out of position. This is effected in the following manner: In Fig. 2 is seen a cam, or block P', which when the bolt holder is thrown into its operating position, is placed between it and the bed piece E, by which mea-ns the bolt holder is held immovable. In order th at the latter may be thrown forward when required the cam P' is depressed before the holder begins to move, as follows: L' is a shaft secured to the uprights C upon which vibrate the arms M', N', (Fig. 5). The latter is connected by the bent lever T', with the slide H', and the arm l\ is connected by O' with the cam P', which vibrates upon the short shaft Q. The arms l\ and N' being cast in one piece, or otherwise united together, it follows that as the slide H' is moved in Vthe direction of its arrow for the purpose of bringing the bolt holder beneath the punch, the cam P', is brought into the position seen in Fig. 2 and the bolt holder is held immovable'. In order that this cam may be depressed out of the way before the bolt holder begins to move, the pin which connects the holder with the slide H', passes through a slot 21' in the slide which enables the latter to move suliiciently to depress the cam P' before the bolt holder vbegins to move. The cam P' is prevented from being thrown down by the pressure upon the bolt holder, by means of the weight S' upon the lever R' which holds the shaft Q' from turning, until the cam P', is depressed by the motion of the slide H'. Z is a hardened steel die, or heading tool, having a hole drilled through its center, of a size corresponding to that of the shank of the bolt.

A2 is a rod which passes up through the center of the Vbolt holder, and has a hole drilled in its upper end to accommodate the rod f (Fig. 2) which supports the bolt while its head is being upset. The rod A2 rests at the point g, in a suitable support B2, and thus as the bolt holder is thrown out, the rod A2 will rise therein and force out the bolt as seen in Fig. 10.

It has heretofore been found very diflicult, both with machine and hand made bolts, to place the shank direct-ly in the center of the head. It is evident however that the sliding socket operating as above described, will cause the head to be upset centrally with respect to the shank, and that this together with the simultaneous and equable operation of thepunches upon opposite sides of the head will entirely remove the difficulty.

Operation: The iron employed is of the size of the shank of the linished bolt, a portion of the metal being upset to form the head, the bolt holder being thrown forward as seen in red in Fig. l0, and the machine being set in motion, a blank (Fig. ll), heated to the proper degree, is dropped into the hole in the heading tool Z', the lever Y' is then depressed, and the cam W operating upon the pin b, returns the bolt holder to its position beneath the upsetting punch, which now descends to upset the metal for the head, the sliding socket surrounding the bolt head and preventing it from being forced. out of center. Before the upsetting punch is raised, the following device is employed for the purpose of freeing the sliding socket from the bolt head. When the socket is in its lowest position, and resting upon the heading tool, the spur k projecting therefrom, bears against the short arm of the lever m,l (which is pivoted at 71,) and raises its longer arm into such a position that it shall be struck by the cam p, upon the shaft X, as the latter revolves, by which means the socket is thrown up and freed from the head of the bolt. This takes place as before stated before the punch commences to rise. The upsetting punch is now drawn up by its crank N, and the sidel punches come up and form two opposite sides of t-he bolt head. As these recede, the bolt holder is caused to make one fourth of a revolution, the wheel Z (Fig. 8) being employed for the purpose. If a siX sided bolt is required, the wheel Y (Fig) is made use of, which gives the bolt holder one sixth of a revolution between each operation of the punches. The hole in the sliding socket is also made to correspond with the shape of the finished bolt head, whether siX or four sided, and is about one thirty second of an inch larger than the bolt head all around. The upsetting punch now descends again and the side punches are brought up to form two new faces of the head. The side and top punches thus alternate with each other, until the bolt head is completed, when the operator raises the lever Y, and the sleeve U', is caused to descend and the cam W, is brought to bear upon the pin c, by which means the bolt holder is thrown out and the bolt is projected from the die Z', whence it is removed by the operator, its place is then supplied by a new blank, and the operation continues as before.

As already stated the sliding socket O prevents the iron of the head from being forced out of center when the upsetting punch rst descends upon it; during the succeeding operations of this punch, the socket is not required, and should it fail to pass down over the head it may rest on top of it, the punch passing freely through itto complete its work upon the bolt head.

What I claim as my invention, and desire to secure by Letters Patent is- 1. The two side punches operating simultaneously and equably upon opposite sides of the bolt, in combination with the interlnittent rotary motion of the bolt holder, for the purpose of finishing the bolt head with its center in the aXis of the shank, as set forth.

2. I claim the forward and back motion of the bolt holder, when the rod A2 which eject-s the bolt, is supported at a point in advance of that on which the bolt holder vibrates, for the purpose of ejecting -the finished'bolt as set forth.

TIMOTHY F. TAFT.

Witnesses: SAM. COOPER, P. E. TEsoHEMAoHER. 

